KF92: A Subwoofer Unlike Any Other

To reproduce serious bass, you need a game-changing loudspeaker that can cope with huge pressure. KF92 does just that. Engineered to blast out chunks of low frequency energy, it’s also subtle enough to pick out the more delicate details of a double bass. It’s a compact, room-friendly subwoofer designed to deepen every listening experience. Supported by two massive 9-inch drivers in a force-cancelling configuration, KF92 is powered by an incredible 1000 Watts (RMS) of power. Optimised with KEF's Music Integrity Engine™, it delivers astonishing levels of deep and controlled bass. With KF92, you don't just feel the air move - you feel the sound move you.

Let's take a look at some of the features that make the KF92 a game-changer:

Appearance
KF92 features the same black gloss finish that defines our R Series. Encompassed in sleek, curved lines, KF92 doesn’t have the harsh, square lines and box-like look of traditional subwoofers. The heatsink design is inspired by the engineering of LSX and LS50 Wireless, resulting in a pleasing, perfectly optimised aesthetic.

1000W of Pure Power
Each driver is fed by a powerful 500W Class D amplifier that was specifically designed for KF92. Class D amplification offers the ability to produce a tremendous amount of power without the hassle of worrying about the excess heat Class A and A-B drivers produce.

Customised DSP and Music Integrity Engine™
Our proprietary Music Integrity Engine™ and Intelligent Bass Extension (iBX) allow for dynamic bass extension at regular listening levels down to 11Hz. You can’t hear 11Hz, but you can feel it. By being able to produce sound that low, we ensure that the very lowest frequencies are reproduced cleanly and quickly, with no distortion.

Room Placement EQ
Five bespoke EQ settings mean optimal performance is easy to attain. It doesn’t matter where you place KF92, whether in a free space, near a wall, a cabinet or even in a corner.

New Driver Design
Inspired by the same technologies used in our Reference and R Series, KF92 features hybrid aluminium/paper cone drivers. They also include over-sized magnets for incredible driver control, speed and power. These drivers are also vented for further power handling and control, and the cone geometry has been carefully designed to help reduce unwanted resonances. The cone helps us pack the best of both worlds into KF92, meaning we have low-mass, accurate response from the paper cone and overall strength and improved damping from the aluminium skin.

Force Canceling Drivers
Two drivers will move more air than just one, and more air moved equals greater overall SPL (volume). However, there’s also a fundamental problem with single-driver subwoofers: for every action, there is an equal and opposite reaction (Newton’s Third Law). As the driver cone pushes backwards, it exerts a force on the basket and that energy is transferred to the cabinet. In extreme cases, a subwoofer will actually “walk” across the floor as a result of that unwanted energy, which is not good for clean audio performance.

By coupling two drivers, the reactive forces of each are cancelled, leaving no excess energy to excite the cabinet and interfere with the bass response of the drivers. The result is cleaner bass response, free from damaging cabinet vibrations, as well as an additional 6dB of overall bass response.

Controls & Inputs
In some cases, for example a mono input from an AC Receiver, only half of the input level is presented to the subwoofer. This means the subwoofer has to work twice as hard to produce the volume you want. But a subwoofer that is working too hard adds distortion. KEF’s SmartConnect technology determines if you are using a mono input or a stereo input and adjusts as necessary to ensure you are getting the proper input level.

KF92 features speaker-level inputs for setups where a line-level input from the receiver or amp is not available. Line-level outputs allow you to daisy-chain multiple KF92s for smooth, standing wave-free performance in any room. A high-pass filter, for even better control and quality, is also available for flexibility in advanced installations.

The Control Panel

Expansion Port: future-proofs KF92, allowing for future accessories.

Crossover: A Low Pass Filter from the inputs allows for smooth integration with the main loudspeakers.

Volume: The volume control has been designed to work the same way the human ear works: from around halfway on up, the increments are smaller allowing for even finer tuning at higher volumes (algorithmically rather than linearly) – where fine tuning of output is more critical for ultimate performance.

Mode (Manual/LFE): Manual utilises the internal crossover and LFE is used with Home Theater configurations where the AV Receiver controls the output to the subwoofer.

EQ: Allows you to set your KF92 in five different settings (free air, wall, corner, cabinet, apartment).

Phase: Switches between 0° and 180° for optimal performance integration with the main loudspeakers.

Ground Lift: Safely breaks the ground connection in the event of a ground loop or AC sneak path that causes low frequency (60 cycle) hum.

Speaker Input: Connects the high-level output of your amplifier to KF92.

Line Input (with SmartConnect): For either mono, L/R or LFE connection. SmartConnect ensures proper input gain.

Line Output HPF: Adjustable High Pass Filter for the Line Outputs in daisy chain configurations.

Line Output: Configure KF92 with other subwoofers or amps as part of a complete multi-device system.

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